I cannot run payrol ending 10-18-2020? Can you help me get out of this loop?

It's nice to have you in the Community, @patches308.

The error you encounter happens when running a payroll if you already have a check created under the same period. Need not worry you can run another payroll for this.

Here's how:

1. On the left menu, click Workers. 
2. Go to the Employees tab. 
3. Tap the Run payroll button.
4. Choose the pay schedule for the payroll you want to create.
5. Hit Continue and enter the correct Pay period and Pay date.
6. Mark the employee and click Create another check for (employee name).
7. Enter the necessary payroll details and click Preview payroll.
8. When done, select Submit payroll. 

For a guide on creating paychecks in QuickBooks Online, see this article: Create pay checks in online payroll.

For future reference, here's a great resource which you may find helpful:

• Change an employee paycheck
• Delete or void pay checks

If you have questions with the process, feel free to update this thread. I'd be around to help. Have a nice day.